Defining Amber, the Game

What defines Amber as a setting?


Possibilities:


Without the concept of Shadow and Real, there's no real reason for the members of the RoyalFamily to squabble, plot, backstab etc.

Without powers like Pattern and Logrus, there's no easy way to get around in Shadow.

If everyone could walk Shadow, then the RoyalFamily isn't really special or interesting. --DaR